package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
@Slf4j
@WebFilter(urlPatterns="/*")
public class TokenFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取请求路径
        String path = request.getRequestURI();
        //判断是否登录请求
        if(path.contains("/login")){
            log.info("登录请求：{}",path);
            filterChain.doFilter(request,response);
            return;
        }
        //获取请求头 token
        String jwt = request.getHeader("token");
        //判断token是否为存在
        if(jwt == null|| jwt.isEmpty()){
            log.info("请求头没有token");
            response.setStatus(401);
            return;
        }
        //解析 token,如果解析报错，则返回401
        try{
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户id存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);
        } catch (Exception e) {
            log.info("token解析错误");
            response.setStatus(401);
            return;
        }
        //放行
        filterChain.doFilter(request,response);
        //释放资源
        log.info("删除ThreadLocal中的登录信息");
        CurrentUserHoler.removeCurrentUser();


    }
}
